I think TonyL's post sums up my own feelings on the item.

If it were given to somone able to run it's effects by a calibrated microphone and a scope ... if it does  ''something'' then the traces will be different. **

The description of that difference in trace is something that we can then rely on our hearing to describe.

Does anyone else have one that they'd be willing to have measured?

Until we progress the debate to looking at something more concrete, then we have .... well we have the situation that TonyL described quite well.

**NB if anyone cares to state that you can have human 'audible' differences that are not measurable... frankly they are barking mad!